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首页> 外文期刊>Environmental toxicology and chemistry >Arsenic Accumulation And Toxicity In The Earthworm Eisenia Fetida Affected By Chloride And Phosphate
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Arsenic Accumulation And Toxicity In The Earthworm Eisenia Fetida Affected By Chloride And Phosphate

机译：et和磷酸盐对worm子ise中砷的累积和毒性

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摘要

Chloride and phosphate (PO_4) were added to field soils contaminated with arsenic and heavy metals, and Eisenia fetida were inoculated in these treated soils for 70 d. After 28 d, earthworm survival, body weight, and cocoon production were measured. During the exposure period, the accumulation of As and four metals (Cu, Zn, Cd, and Pb) in E. fetida was analyzed. Bulk soils and soil solutions were characterized for the contents of As, metals, organic matter, and major cations and anions; cation exchange capacity; and pH. Although addition of Cl to the soil did not impact As toxicity, it significantly reduced As uptake. The addition of PO_4 induced changes in As toxicity and reduced As accumulation even though the As concentration in the soil pore water increased because of the substitution of As by P at soil sorption sites. These results imply that the addition of Cl induced the formation of an As-Cl complex, thereby resulting in decreased As bioavailability; they also imply that monovalent phosphate (H_2PO_4~-) competes with As for uptake through transporter-mediated mechanisms in cells.
机译：将氯化物和磷酸盐（PO_4）添加到被砷和重金属污染的田间土壤中，并在这些处理过的土壤中接种Fetida Eetnia 70天。 28天后，测量measured的存活，体重和茧的产生。在暴露期间，分析了F. fetida中As和四种金属（Cu，Zn，Cd和Pb）的积累。表征了大块土壤和土壤溶液中As，金属，有机物以及主要阳离子和阴离子的含量。阳离子交换量和pH值。尽管向土壤中添加Cl不会影响As的毒性，但会显着降低As的吸收。 PO_4的添加引起了As毒性的变化并减少了As的积累，尽管由于土壤吸附位点上As被P取代，导致土壤孔隙水中的As浓度增加。这些结果暗示Cl的添加诱导As-Cl络合物的形成，从而导致As生物利用度降低。他们还暗示单价磷酸盐（H_2PO_4〜-）与As竞争通过转运蛋白介导的细胞吸收机制。

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